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The display was mounted on panel PCB (with u-switches and LEDs), which has another chip controller covered resin also. Unfortunately I got panel only and I can't sniff interface during working of printer.I conducted an analysis of connections and D0, D2, D3 is connected to the controller chip on panel PCB, D1 is connected to outside of panel (through the connector). This is strange, because it means that control of some display parameters have been moved to outside of controller panel. Rest of pins was easy to find (+, GND, light).